Domains

Format and response options

Each domain scale begins with a brief definition of the domain, and then asks the respondent to endorse what level of disability s/he experiences with regard to performing his/her normal activities of daily living. The estimated completion time of 2 min. Higher scores represent more impairment.

Footnotes

Since many studies use NARCOMS samples or subsamples, it is not possible to know how many of the 321,000 people are actually the same person in multiple studies. Data bases provided to NARCOMS investigators are de-identified.

Funding

This work was not funded by any grant or contract.

Availability of data and materials

Supporting documentation for our findings is provided in manuscript data and supplementary tables. Scientists wishing to gain access to our data may contact the first author (CES), who will consider such requests on a case-by-case basis, subject to the scientific rigor of the proposed research question.

Authors’ contributions

CES conceived of and designed the study, and drafted the manuscript. VEP and CES carried out the literature review. VEP summarized all of the findings in tabular and graphic format, performed the statistical analyses, and helped to draft the manuscript. Both authors read and approved the final manuscript.

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Copyright information

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